[PATCH] add the possibility to define a subset of channels used by the ACS engine when not operating on DFS channels

[Adrien Decostre]

---
 src/ap/acs.c |   21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/ap/acs.c b/src/ap/acs.c
index 97cf26f..21d932e 100644
--- a/src/ap/acs.c
+++ b/src/ap/acs.c
@@ -454,6 +454,20 @@ static int acs_usable_chan(struct
hostapd_channel_data *chan)
        return 1;
 }

+static int is_in_chanlist(struct hostapd_iface *iface,
+                          struct hostapd_channel_data *chan)
+{
+        int *entry;
+
+        if (!iface->conf->chanlist)
+                return 1;
+
+        for (entry = iface->conf->chanlist; *entry != -1; entry++) {
+                if (*entry == chan->chan)
+                        return 1;
+        }
+        return 0;
+}

 static void acs_survey_all_chans_intereference_factor(
        struct hostapd_iface *iface)
@@ -467,6 +481,9 @@ static void acs_survey_all_chans_intereference_factor(
                if (!acs_usable_chan(chan))
                        continue;

+               if (!is_in_chanlist(iface, chan))
+                       continue;
+
                wpa_printf(MSG_DEBUG, "ACS: Survey analysis for
channel %d (%d MHz)",
                           chan->chan, chan->freq);

@@ -542,7 +559,9 @@ acs_find_ideal_chan(struct hostapd_iface *iface)

                if (chan->flag & HOSTAPD_CHAN_DISABLED)
                        continue;
-
+
+               if (!is_in_chanlist(iface, chan))
+                       continue;

                /* HT40 on 5 GHz has a limited set of primary channels as per
                 * 11n Annex J */
--
1.7.9.5